<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll" :disabled="goodList.length === 0" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <!-- @isTrue="isTrue(item, $event) -->
        <car-tr v-for="(item, index) in goodList" :key="index" :obj="item" @delTr="delTr(index)" />
      </tbody>
      <tfoot>
        <Total :allPrice="addPrice" />
      </tfoot>
    </table>
  </div>
</template>

<script>
import CarTr from './components/CarTr.vue'
import Total from './components/Total.vue'

export default {
  data () {
    return {
      goodList: [
        {
          name: '诸葛亮',
          price: 1000,
          num: 1,
          checked: false
        },
        {
          name: '蔡文姬',
          price: 1500,
          num: 1,
          checked: false
        },
        {
          name: '妲己',
          price: 2000,
          num: 1,
          checked: false
        },
        {
          name: '鲁班',
          price: 2200,
          num: 1,
          checked: false
        }
      ]
    }
  },

  methods: {
    delTr (index) {
      this.goodList.splice(index, 1)
    }
  },
  computed: {
    /* isAll () {
      return this.goodList.every(item => item.checked)
    } */
    isAll: {
      get () {
        return this.goodList.length !== 0 && this.goodList.every(item => item.checked)
      },
      set (val) {
        this.goodList.forEach(item => {
          item.checked = val
        })
      }
    },
    addPrice () {
      const isTrueArr = this.goodList.filter(item => item.checked === true)
      return isTrueArr.reduce((sum, item) => {
        return (sum += item.num * item.price)
      }, 0)
    }
  },
  components: {
    CarTr,
    Total
  }
}
</script>

<style>
</style>
